Malicious PDF — malware analysis report

Static analysis result for SHA-256 11d8b804cbdb5bd0…

MALICIOUS

PDF

75.3 KB Created: 2021-06-18 10:55:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 148eccfd0545a520b494c7691dbbba26 SHA-1: c07754b3dee9c6fc98c0d6b720c893c586708475 SHA-256: 11d8b804cbdb5bd075ea1f7759721dc4880cb359499fc6352ec2476f0344ba6f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm pointing to compromised WordPress sites and disposable hosting, likely to trick users into downloading malware. The presence of a visual download button further supports a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://bienenaktuell.com/sites/bienenaktuell.com/files/file/78219812598.pdf
    • https://pametnidom.hr/pametne_kuce/userfiles/file/rofebuselerikopudemo.pdf
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609647cb40916---99984190949.pdf
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/d8bbfd0e0c46445c0595ff385af6f2da/tewuwitatizozedodet.pdf
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/slon46c534ruriv4dcd1a6vmp0/8503257994.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093223ac0b1d---goruropexekijuxepir.pdf
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/f3626d9c872607b68e1c2473d7ef03b1/sumezoxowivaziluxusez.pdf
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/961849e2fafa58a3c55ae34c4c08d709/mumaforezezusifotidavi.pdf
    • https://thinkhigh-tech.com/d/files/34478914646.pdf
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/208d8ad7f80dfca1610119c52fdcd0f6/padejibojoxijitenogo.pdf
    • http://poorclarescork.ie/images/tikufo.pdf
    • https://watfordfairtrade.org/app/webroot/img/files/kumonasotela.pdf
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160be0f3514ad1---wagamufobopewubinemaxus.pdf
    • https://memoservicesrl.it/file/99610748347.pdf
    • http://gemculture.com/userfiles/file/xazunag.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=daru+badnam+kardi+dj+song+mp3+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c511.bin
ea0400146fed577b22fb4aee596f1c740d363f83cc1d1ba053a47b6a91d8689b
pdf-font-stream PDF embedded font (sfnt) at offset 0xC511 5812 bytes
font_01_sfnt_off0000d8d8.bin
f38ced8b318eeb1390d1e7e25ff2773e824904fa34de7d4ccc49ac65ec427642
pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D8 2252 bytes
font_02_sfnt_off0000e32d.bin
72b75bdcf26b4143e8f9ff6267f58bb5992f5adf5651838e7824ca0a728aabd2
pdf-font-stream PDF embedded font (sfnt) at offset 0xE32D 10632 bytes
font_03_sfnt_off000107f3.bin
ddd299b4c6ab016e17668ce1a46afe5ae56bdc407d307851c4d341e23353083b
pdf-font-stream PDF embedded font (sfnt) at offset 0x107F3 6652 bytes